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How to retain calling party's caller ID on a call foward in asterisk

Posted on 2010-08-17
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Last Modified: 2013-11-12
With a Cisco 7940 running SIP and the CFwdALL button is used, the calling party's caller ID information is retained through the call and ends up at the destination.  I'm trying to do a call forward in Asterisk that simulates this but the problem I have is that Asterisk requires a valid callerID number to make the outbound dial; it won't process the call through the system with the received caller ID "originating" the call.

What is it about a Cisco and its SIP Response 302 "Moved Temporarily" that enables an outbound call to be made?  Can that be simulated in the dialplan without a Cisco phone in the middle?
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Question by:chrisvz94
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4 Comments
 
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Expert Comment

by:Ron Malmstead
ID: 33512866
You can set the callerid at any point in the dialplan...

exten => s,n,Set(CALLERID(num)=5555555555)


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Author Comment

by:chrisvz94
ID: 33583174
Thanks, xuserx2000.  For some reason that I don't understand, however, is that if I set the caller ID in the dialplan, the screening ANI of the PRI overwrites the caller ID that I set.  BUT, when the Cisco phone is set to call forward the call, the PRI doesn't overwrite the caller ID to the screening ANI.
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Ron Malmstead earned 2000 total points
ID: 33877492
I think the "trick" then... is to leave off the call forwarding feature on the phone itself, and instead make it a feature of your dialplan so that you can control the callerid.

Seems it's the behaviour of the Cisco phone that is giving you the trouble.
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Author Comment

by:chrisvz94
ID: 33923642
I think you're right, xuserx2000.  I'm having trouble finding the solution to that trick.  Thanks for your help and suggetions!
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